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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b38b22b93f1dc5459360f744accc9a8f6b427791cc9c4154cbd902a052dcd6f7' 
  AND token = 'l4gGg/zSckj4xu42ygRTFNWe/t+hzzluqy6NARv7Ysk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}